How severe is CVE-2006-3942?

CVE-2006-3942 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2006-3942 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 76% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-3942?

CVE-2006-3942 primarily affects Microsoft Windows 2000. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-3942?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2006-3942 published?

CVE-2006-3942 was published on 2006-07-31 and last updated on 2026-06-16.

CVE-2006-3942

CVE-2006-3942 is a high-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 76% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 76% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Microsoft Windows 2000
Published: 2006-07-31
Last modified: 2026-06-16

Description

The server driver (srv.sys) in Microsoft Windows NT 4.0, 2000, XP, and Server 2003 allows remote attackers to cause a denial of service (system crash) via an SMB_COM_TRANSACTION SMB message that contains a string without null character termination, which leads to a NULL dereference in the ExecuteTransaction function, possibly related to an "SMB PIPE," aka the "Mailslot DOS" vulnerability. NOTE: the name "Mailslot DOS" was derived from incomplete initial research; the vulnerability is not associated with a mailslot.

Frequently asked questions

What is CVE-2006-3942?: The server driver (srv.sys) in Microsoft Windows NT 4.0, 2000, XP, and Server 2003 allows remote attackers to cause a denial of service (system crash) via an SMB_COM_TRANSACTION SMB message that contains a string without null character termination, which leads to a NULL dereference in the ExecuteTransaction function, possibly related to an "SMB PIPE," aka the "Mailslot DOS" vulnerability. NOTE: the name "Mailslot DOS" was derived from incomplete initial research; the vulnerability is not associated with a mailslot.
How severe is CVE-2006-3942?: CVE-2006-3942 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2006-3942 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 76% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-3942?: CVE-2006-3942 primarily affects Microsoft Windows 2000. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-3942?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2006-3942 published?: CVE-2006-3942 was published on 2006-07-31 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:o:microsoft:windows_2000:*:sp4:*:fr:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:64-bit:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:itanium:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:sp1:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:sp1:*:itanium:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:*:64-bit:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp1:tablet_pc:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp2:tablet_pc:*:*:*:*:*

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